Odpowiedź:
a)
I x - 5 I ≤ 4
x- 5 ≥ - 4 i x - 5 ≤ 4
x ≥ - 4 + 5 x ≤ 4 + 5
x ≥ 1 i x ≤ 9
x ∈ < 1 , 9 >
=============
b )
I x + 4 I < 5
x + 4 > - 5 i x + 4 < 5
x > - 9 x < 1
x ∈ ( - 9 , 1 )
================
c )
I x - 3 I ≥ 2
x - 3 ≤ - 2 lub x - 3 ≥ 2
x ≤ - 2 + 3 x ≥ 2 + 3
x ≤ 1 lub x ≥ 5
x ∈ ( - ∞ , 1 > ∪ < 5, +∞ )
==========================
e )
I 6 - x I < 4
6 - x > - 4 i 6 - x < 4
- x > - 4 - 6 - x < 4 - 6
- x > - 10 - x < - 2 / * ( - 1)
x < 10 x > 2
x ∈ ( 2, 10 )
d, f - podobnie jak a, b, c
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Odpowiedź:
a)
I x - 5 I ≤ 4
x- 5 ≥ - 4 i x - 5 ≤ 4
x ≥ - 4 + 5 x ≤ 4 + 5
x ≥ 1 i x ≤ 9
x ∈ < 1 , 9 >
=============
b )
I x + 4 I < 5
x + 4 > - 5 i x + 4 < 5
x > - 9 x < 1
x ∈ ( - 9 , 1 )
================
c )
I x - 3 I ≥ 2
x - 3 ≤ - 2 lub x - 3 ≥ 2
x ≤ - 2 + 3 x ≥ 2 + 3
x ≤ 1 lub x ≥ 5
x ∈ ( - ∞ , 1 > ∪ < 5, +∞ )
==========================
e )
I 6 - x I < 4
6 - x > - 4 i 6 - x < 4
- x > - 4 - 6 - x < 4 - 6
- x > - 10 - x < - 2 / * ( - 1)
x < 10 x > 2
x ∈ ( 2, 10 )
================
d, f - podobnie jak a, b, c
------------------------------------------------
Szczegółowe wyjaśnienie: